Feedback Control of Nonlinear Quantum Systems: A Rule of Thumb
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We show that in the regime in which feedback control is most effective-when measurements are relatively efficient, and feedback is relatively strong-then, in the absence of any sharp inhomogeneity in the noise, it is always best to measure in a basis that does not commute with the system density matrix than one that does. That is, it is optimal to make measurements that disturb the state one is attempting to stabilize.
Physical Review Letters
Copyright 2007 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.